In terms of being rational, identity is just a kind of bias (among many) that needs to be removed.
I think a slightly more accurate generalization of PG's point is that many beliefs and belief systems permit learning (changing the belief) in the face of new evidence or perspective.
The things we most often consider "identity" oriented beliefs are the things that people are unable or unwilling to question (or to consider that they might be wrong about).
So a good way to find you own rationality limiting beliefs is to ask "What am I certain about?".
Politics attempts to solve the coordination problems around use of force, coercion, bribery, money, and infrastructure.
Identity is simply a useful way to rally voters for a political cause, which is why it's used by political and religious charlatans alike.
I think a slightly more accurate generalization of PG's point is that many beliefs and belief systems permit learning (changing the belief) in the face of new evidence or perspective.
The things we most often consider "identity" oriented beliefs are the things that people are unable or unwilling to question (or to consider that they might be wrong about).
So a good way to find you own rationality limiting beliefs is to ask "What am I certain about?".
Politics attempts to solve the coordination problems around use of force, coercion, bribery, money, and infrastructure.
Identity is simply a useful way to rally voters for a political cause, which is why it's used by political and religious charlatans alike.